Pertlikite

pertlikite

metavoltine

botryogen

alunite

Images

Formula: K₂(Fe²⁺,Mg)₂(Mg,Fe³⁺)₄Fe³⁺₂Al(SO₄)₁₂.18H₂O
Hydrated sulphate, voltaite group
Crystal System: Tetragonal
Specific gravity: 2.59 measured, 2.56 calculated
Streak: Greyish green
Colour: Dark olive green to black
Luminescence: Not fluorescent under UV
Environments

Volcanic igneous rocks

Localities

At the Alcaparrosa Mine, Sierra Gorda, Antofagasta Province, Antofagasta, Chile, crystals of pertlikite have been found (Mindat photo).
Pertlikite from the Alcaparrosa Mine - Image

At the type locality, the Zagh Mine, Hajjiabad, Hajjiabad County, Hormozgan Province, Iran, pertlikite occurs in a pyrite-bearing trachytic eruptive rock, and probably formed after the decomposition of pyrite. Pertlikite forms single crystals up 1 cm; the phase is associated with metavoltine, botryogen, pyrite and alunite (CM 46.661-669).

Back to Minerals